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Senior Full-Stack Developer

Madrid, Lisbon
Full-time
Permanent employee
70,000 - 90,000 € per year

What You’ll Do

As a Senior Full-Stack Developer at InteractiveAI, you will build core features across both the frontend and backend of our platform—shipping elegant interfaces, robust APIs, scalable services, and reliable tooling used by enterprise customers and internal teams.
This is a hands-on, high-ownership engineering role: you will architect systems, write production-grade code, design efficient data flows, and ship end-to-end features that directly shape our product experience.
  • Design, architect, and implement backend services, microservices, and internal tooling
  • Build modern, responsive, and performant frontend applications using React, TypeScript, and Tailwind
  • Develop and maintain RESTful and GraphQL APIs that power key platform functionalities
  • Integrate third-party services, authentication systems, and enterprise connectors
  • Collaborate with product and design to craft intuitive user experiences and smooth interaction flows
  • Deploy and manage containerized applications using Docker and Kubernetes
  • Work with databases such as Postgres, Redis, and/or ClickHouse—handling schema design, migrations, and query performance
  • Implement and maintain CI/CD pipelines, testing frameworks, and release workflows
  • Troubleshoot production issues, performance problems, and service reliability incidents
  • Take full ownership of features from design to production, including documentation and monitoring

What We’re Looking For

We’re looking for a highly skilled engineer with strong full-stack fundamentals, proven delivery, and the ability to build elegant, scalable systems across the entire web stack.

Minimum Requirements:
  • 5+ years experience building and deploying full-stack applications in production
  • Strong proficiency with TypeScript, JavaScript, and modern frontend frameworks (React required)
  • Backend experience with Node.js, Python, or similar server-side technologies
  • Experience designing and consuming RESTful and GraphQL APIs
  • Hands-on experience with Docker, containers, and Kubernetes deployments
  • Strong understanding of relational and/or analytical databases (Postgres, Redis, ClickHouse)
  • Experience working with cloud providers (AWS, GCP, or Azure)
  • Familiarity with Infrastructure as Code tools such as Terraform
  • Solid grasp of CI/CD pipelines, automated testing, and release management
  • Excellent communication skills and ability to collaborate in cross-functional teams
Nice-to-Haves:
  • Experience with multi-tenant SaaS architectures or high-throughput systems
  • Experience with state management libraries (Zustand, Redux, Recoil)
  • Familiarity with event-driven architectures and message queues
  • Exposure to enterprise security best practices (IAM, VPC, encryption)
  • Contributions to open-source or active involvement in tech communities

What You’ll Get

  • Competitive base salary (€70,000/yr to €90,000/yr) + performance bonuses
  • Access to equity/share plan as it rolls out
  • Private health insurance
  • Flexible work setup + travel when needed (ideally Hybrid in Lisbon or Madrid)
  • 23 days PTO (excluding local public holidays)

Who You Are

  • Proactive & Resourceful: You identify problems early and drive solutions independently.
  • High-Ownership: You treat the platform and codebase as your own and deliver high-quality work consistently.
  • Execution-Driven: You thrive in a fast-paced startup environment and enjoy shipping user-facing features.
  • Collaborative: You communicate clearly, engage well with product/design/engineering peers, and mentor others when needed.

Interview Process

We keep our process focused and respectful of your time. Most candidates complete it in 2–3 weeks. Here’s what to expect:
  1. Intro Call – 30 minutes to align on fit and expectations
  2. Take-Home Challenge – A practical task based on real-world engineering problems
  3. Technical Interview – Deep dive into software architecture, system design, and implementation skills
  4. Cultural and Values Interview – Exploration of motivation, communication style, and team alignment
  5. Offer – Final conversation and offer
We’re forming a team of builders — people who care about impact, quality, and growth. If that’s you, let’s talk — careers@interactive.ai

About us

InteractiveAI is a fast-growing startup on a mission to empower enterprises with fully managed AI agent lifecycles. 

We are building the next generation of enterprise AI solutions, delivering an innovative, scalable, and compliant agentic AI infrastructure to businesses across industries. Our platform allows organisations to build, own, and scale AI that learns from every interaction.

We value autonomy, speed, and innovation and are building a world-class team to match. Our squads are lean, focused, and execution-driven. If you thrive in high-performance environments and want to be part of a company that rewards transformational outcomes, this is for you.